I keep losing these links, so perhaps a post will help.
Most of the literary sources for St Nicholas of Myra were published by G. Anrich, Hagios Nikolaos. Der heilige Nikolaos in der griechischen Kirche, in two volumes before WW1. These are online at Hathi Trust, for US readers only – in case worldwide rioting breaks out at seeing these books online -, but an online version does exist on a German site at Gottingen, the Göttinger Digitalisierungszentrums (Göttingen Digitisation Centre). The quality of scans at this site is better than those at Google, and, where they have something, it’s best to use their site.
Here are the volumes of Anrich:
You can download an (excellent) PDF of each volume. The link to the PDF of the complete volume is the first one:
The other links are to sections of the work. I must say that I have myself found this presentation quite useful. This is because I am working on individual slices of the work at the moment, when I really don’t want the whole PDF. It has been very convenient to have this table of contents online too. That said … I think most people might not realise that the whole work can be downloaded.
Note: Post substantially reworked 16/2/16, after GDZ site structure changed.